Hydraulic Shovel Motor Speed Control for Low-Power Composite Operation
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Solution Overview
Problem
In hydraulic shovel operations, the power consumption of the electric motor increases due to excessive motor revolutions when the operation lever is compositely operated, even in fine operation regions, leading to inefficient energy use.
Innovation Solution
A working control device that adjusts the number of motor revolutions based on the operation amount, setting the necessary minimum revolutions for single and composite operations, and using a coefficient to optimize the total number of revolutions in composite operations to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor is controlled to drive in the necessary minimum number of revolutions required for the hydraulic pump even when the operation amount is small, then the hydraulic pump can maintain its performance, but the power consumption of the electric motor increases unnecessarily in composite operations
Solution Approach 1:
The control method dynamically adjusts the electric motor's driving revolutions based on the operation state. When the operation lever is not fully operated (operation amount ≤ threshold), the motor drives at necessary minimum revolutions. When the operation lever is fully operated (operation amount > threshold), the motor drives at operation-corresponding revolutions. This dynamic adjustment resolves the contradiction between maintaining hydraulic pump performance and reducing power consumption.
Solution Approach 2:
The invention changes the operating parameter (driving revolutions) of the electric motor based on the operation amount of the operation lever. By setting a threshold value for the operation amount, the system switches between two operating modes: necessary minimum revolutions mode for small operations and operation-corresponding revolutions mode for large operations. This parameter change approach allows the system to optimize power consumption while ensuring adequate hydraulic pump performance.
2Use of energy by moving object
If the electric motor is controlled to drive in the operation-corresponding number of revolutions according to the operation amount, then the power consumption matches the operation needs, but the hydraulic pump cannot maintain adequate performance when revolutions fall below the necessary minimum
Solution Approach 1:
The control method dynamically adjusts the electric motor's driving revolutions based on the operation state. When the operation lever is not fully operated (operation amount ≤ threshold), the motor drives at necessary minimum revolutions. When the operation lever is fully operated (operation amount > threshold), the motor drives at operation-corresponding revolutions. This dynamic adjustment resolves the contradiction between maintaining hydraulic pump performance and reducing power consumption.
Solution Approach 2:
The invention changes the operating parameter (driving revolutions) of the electric motor based on the operation amount of the operation lever. By setting a threshold value for the operation amount, the system switches between two operating modes: necessary minimum revolutions mode for small operations and operation-corresponding revolutions mode for large operations. This parameter change approach allows the system to optimize power consumption while ensuring adequate hydraulic pump performance.
3Reliability
If the necessary minimum number of revolutions is set for all operations including fine operations, then the hydraulic pump performance is maintained, but the power consumption increases unnecessarily for small operation amounts
Solution Approach 1:
The control method dynamically adjusts the electric motor's driving revolutions based on the operation state. When the operation lever is not fully operated (operation amount ≤ threshold), the motor drives at necessary minimum revolutions. When the operation lever is fully operated (operation amount > threshold), the motor drives at operation-corresponding revolutions. This dynamic adjustment resolves the contradiction between maintaining hydraulic pump performance and reducing power consumption.
Solution Approach 2:
The invention changes the operating parameter (driving revolutions) of the electric motor based on the operation amount of the operation lever. By setting a threshold value for the operation amount, the system switches between two operating modes: necessary minimum revolutions mode for small operations and operation-corresponding revolutions mode for large operations. This parameter change approach allows the system to optimize power consumption while ensuring adequate hydraulic pump performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces motor driving revolutions and power consumption during small operation amounts, ensuring the electric motor operates at a necessary minimum, thereby enhancing energy efficiency.
Implementation Method 1
a hydraulic pump to be driven by the electric motor, and a plurality of hydraulic actuators that are worked upon receipt of working oil to be discharged from the hydraulic pump
Data Source
AI summary
A working control device comprises an operation lever for making a boom cylinder (36), an arm cylinder (37) and others work to drive a shovel apparatus (30), and a delivered oil amount control device (a controller (150)). A working oil supply source includes a first electric motor (M1) and a first hydraulic pump (P1). When the operation lever is subjected to a single operation, a number of the motor revolution based on the lever operation is set to control the first electric motor. When the number of motor revolution is less than a necessary minimum number of revolutions, the necessary minimum number is set to control the first electric motor (M1). When the operation lever is subjected to a composite operation, a total number of motor revolutions based on the lever operations is set. When the total number is less than a necessary minimum number of revolutions, the necessary minimum number is set to control the first electric motor (M1).